kawasaki engin problem

I got a gravely wb 1st of last month. had horse power problems. took it to the dealer & he discovered gas in the oil. said prob was float in carb bouncing on trailor. put shut off valve & changed oil. a-ok.
week later gas in oil again called gravely tech , said needle might be stuck, off to dealer wating on new carb to come in. my concern is there is alot of blowby like either rings or valves are shot.
could I have a bum engin
both gravely & my dealer have been wonderful, i just want to check with the board
thanks

I have shut the fuel off religiously every time as well as a solid minute at 1/2 speed to cool off b-4 suhtting down. shes running fine & I do have a 2 yr warranty, so I guess it it does blow I'll be ok. I'll check back when the new carb is in.
again gravely & the dealer has 100% been there for service